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remove obsolete test ClusterDns [Feature:Example] [Feature:Networking-IPv4] should create pod that uses DNS
This commit is contained in:
Antonio Ojea
parent
3baaac6286
commit
79ef4668cd
@ -1,205 +0,0 @@
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/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package network
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import (
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"context"
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"fmt"
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"path/filepath"
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"strings"
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"time"
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"github.com/onsi/ginkgo/v2"
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v1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/wait"
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clientset "k8s.io/client-go/kubernetes"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/test/e2e/feature"
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"k8s.io/kubernetes/test/e2e/framework"
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e2ekubectl "k8s.io/kubernetes/test/e2e/framework/kubectl"
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e2enetwork "k8s.io/kubernetes/test/e2e/framework/network"
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e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
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e2eoutput "k8s.io/kubernetes/test/e2e/framework/pod/output"
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e2eresource "k8s.io/kubernetes/test/e2e/framework/resource"
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e2eservice "k8s.io/kubernetes/test/e2e/framework/service"
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e2etestfiles "k8s.io/kubernetes/test/e2e/framework/testfiles"
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"k8s.io/kubernetes/test/e2e/network/common"
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admissionapi "k8s.io/pod-security-admission/api"
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)
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const (
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dnsReadyTimeout = time.Minute
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// RespondingTimeout is how long to wait for a service to be responding.
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RespondingTimeout = 2 * time.Minute
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)
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const queryDNSPythonTemplate string = `
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import socket
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try:
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socket.gethostbyname('%s')
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print('ok')
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except:
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print('err')`
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var _ = common.SIGDescribe("ClusterDns", feature.Example, feature.NetworkingIPv4, func() {
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f := framework.NewDefaultFramework("cluster-dns")
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f.NamespacePodSecurityLevel = admissionapi.LevelPrivileged
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var c clientset.Interface
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ginkgo.BeforeEach(func() {
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c = f.ClientSet
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})
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read := func(file string) string {
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data, err := e2etestfiles.Read(file)
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if err != nil {
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framework.Fail(err.Error())
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}
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return string(data)
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}
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ginkgo.It("should create pod that uses dns", func(ctx context.Context) {
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// contrary to the example, this test does not use contexts, for simplicity
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// namespaces are passed directly.
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// Also, for simplicity, we don't use yamls with namespaces, but we
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// create testing namespaces instead.
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backendName := "dns-backend"
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frontendName := "dns-frontend"
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clusterDnsPath := "test/e2e/testing-manifests/cluster-dns"
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podOutput := "Hello World!"
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// we need two namespaces anyway, so let's forget about
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// the one created in BeforeEach and create two new ones.
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namespaces := []*v1.Namespace{nil, nil}
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for i := range namespaces {
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var err error
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namespaceName := fmt.Sprintf("dnsexample%d", i)
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namespaces[i], err = f.CreateNamespace(ctx, namespaceName, nil)
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framework.ExpectNoError(err, "failed to create namespace: %s", namespaceName)
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}
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for _, ns := range namespaces {
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e2ekubectl.RunKubectlOrDieInput(ns.Name, read(filepath.Join(clusterDnsPath, "dns-backend-rc.yaml")), "create", "-f", "-")
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}
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for _, ns := range namespaces {
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e2ekubectl.RunKubectlOrDieInput(ns.Name, read(filepath.Join(clusterDnsPath, "dns-backend-service.yaml")), "create", "-f", "-")
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}
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// wait for objects
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for _, ns := range namespaces {
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e2eresource.WaitForControlledPodsRunning(ctx, c, ns.Name, backendName, api.Kind("ReplicationController"))
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framework.ExpectNoError(e2enetwork.WaitForService(ctx, c, ns.Name, backendName, true, framework.Poll, framework.ServiceStartTimeout))
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}
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// it is not enough that pods are running because they may be set to running, but
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// the application itself may have not been initialized. Just query the application.
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for _, ns := range namespaces {
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label := labels.SelectorFromSet(labels.Set(map[string]string{"name": backendName}))
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options := metav1.ListOptions{LabelSelector: label.String()}
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pods, err := c.CoreV1().Pods(ns.Name).List(ctx, options)
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framework.ExpectNoError(err, "failed to list pods in namespace: %s", ns.Name)
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err = e2epod.WaitForPodsResponding(ctx, c, ns.Name, backendName, false, 0, pods)
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framework.ExpectNoError(err, "waiting for all pods to respond")
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framework.Logf("found %d backend pods responding in namespace %s", len(pods.Items), ns.Name)
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err = waitForServiceResponding(ctx, c, ns.Name, backendName)
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framework.ExpectNoError(err, "waiting for the service to respond")
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}
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// Now another tricky part:
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// It may happen that the service name is not yet in DNS.
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// So if we start our pod, it will fail. We must make sure
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// the name is already resolvable. So let's try to query DNS from
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// the pod we have, until we find our service name.
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// This complicated code may be removed if the pod itself retried after
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// dns error or timeout.
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// This code is probably unnecessary, but let's stay on the safe side.
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label := labels.SelectorFromSet(labels.Set(map[string]string{"name": backendName}))
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options := metav1.ListOptions{LabelSelector: label.String()}
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pods, err := c.CoreV1().Pods(namespaces[0].Name).List(ctx, options)
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if err != nil || pods == nil || len(pods.Items) == 0 {
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framework.Failf("no running pods found")
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}
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podName := pods.Items[0].Name
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queryDNS := fmt.Sprintf(queryDNSPythonTemplate, backendName+"."+namespaces[0].Name)
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_, err = e2eoutput.LookForStringInPodExec(namespaces[0].Name, podName, []string{"python", "-c", queryDNS}, "ok", dnsReadyTimeout)
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framework.ExpectNoError(err, "waiting for output from pod exec")
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updatedPodYaml := strings.Replace(read(filepath.Join(clusterDnsPath, "dns-frontend-pod.yaml")), fmt.Sprintf("dns-backend.development.svc.%s", framework.TestContext.ClusterDNSDomain), fmt.Sprintf("dns-backend.%s.svc.%s", namespaces[0].Name, framework.TestContext.ClusterDNSDomain), 1)
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// create a pod in each namespace
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for _, ns := range namespaces {
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e2ekubectl.RunKubectlOrDieInput(ns.Name, updatedPodYaml, "create", "-f", "-")
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}
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// wait until the pods have been scheduler, i.e. are not Pending anymore. Remember
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// that we cannot wait for the pods to be running because our pods terminate by themselves.
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for _, ns := range namespaces {
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err := e2epod.WaitForPodNotPending(ctx, c, ns.Name, frontendName)
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framework.ExpectNoError(err)
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}
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// wait for pods to print their result
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for _, ns := range namespaces {
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_, err := e2eoutput.LookForStringInLog(ns.Name, frontendName, frontendName, podOutput, framework.PodStartTimeout)
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framework.ExpectNoError(err, "pod %s failed to print result in logs", frontendName)
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}
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})
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})
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// waitForServiceResponding waits for the service to be responding.
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func waitForServiceResponding(ctx context.Context, c clientset.Interface, ns, name string) error {
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ginkgo.By(fmt.Sprintf("trying to dial the service %s.%s via the proxy", ns, name))
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return wait.PollUntilContextTimeout(ctx, framework.Poll, RespondingTimeout, true, func(ctx context.Context) (done bool, err error) {
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proxyRequest, errProxy := e2eservice.GetServicesProxyRequest(c, c.CoreV1().RESTClient().Get())
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if errProxy != nil {
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framework.Logf("Failed to get services proxy request: %v:", errProxy)
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return false, nil
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}
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ctx, cancel := context.WithTimeout(ctx, framework.SingleCallTimeout)
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defer cancel()
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body, err := proxyRequest.Namespace(ns).
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Name(name).
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Do(ctx).
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Raw()
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if err != nil {
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if ctx.Err() != nil {
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framework.Failf("Failed to GET from service %s: %v", name, err)
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return true, err
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}
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framework.Logf("Failed to GET from service %s: %v:", name, err)
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return false, nil
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}
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got := string(body)
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if len(got) == 0 {
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framework.Logf("Service %s: expected non-empty response", name)
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return false, err // stop polling
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}
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framework.Logf("Service %s: found nonempty answer: %s", name, got)
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return true, nil
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})
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}
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@ -1,21 +0,0 @@
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apiVersion: v1
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kind: ReplicationController
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metadata:
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name: dns-backend
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labels:
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name: dns-backend
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spec:
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replicas: 1
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selector:
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name: dns-backend
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template:
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metadata:
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labels:
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name: dns-backend
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spec:
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containers:
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- name: dns-backend
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image: registry.k8s.io/example-dns-backend:v1
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ports:
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- name: backend-port
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containerPort: 8000
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@ -1,9 +0,0 @@
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kind: Service
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apiVersion: v1
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metadata:
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name: dns-backend
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spec:
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ports:
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- port: 8000
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selector:
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name: dns-backend
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@ -1,16 +0,0 @@
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apiVersion: v1
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kind: Pod
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metadata:
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name: dns-frontend
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labels:
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name: dns-frontend
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spec:
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containers:
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- name: dns-frontend
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image: registry.k8s.io/example-dns-frontend:v1
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command:
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- python
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- client.py
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- http://dns-backend.development.svc.cluster.local:8000
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imagePullPolicy: Always
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restartPolicy: Never
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@ -22,7 +22,7 @@ import (
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e2etestfiles "k8s.io/kubernetes/test/e2e/framework/testfiles"
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)
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//go:embed cluster-dns dra flexvolume guestbook kubectl sample-device-plugin scheduling/nvidia-driver-installer.yaml statefulset storage-csi
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//go:embed dra flexvolume guestbook kubectl sample-device-plugin scheduling/nvidia-driver-installer.yaml statefulset storage-csi
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var e2eTestingManifestsFS embed.FS
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func GetE2ETestingManifestsFS() e2etestfiles.EmbeddedFileSource {
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